When doing a full due diligence on these companies, I found out that their trustpilot rating was 1 star and read several lawsuits filed against them, by multiple homeowners.

If you house hack a single family residence by renting out  a room or two then you would have no property tax but if you buy a duplex you might have to pro-rate the property tax.  

Question: Should I collateralize the loan (if using private or hard money), or rely on roll-over loans (to maximize the lower points and 3-4% rate)?

For $10K and a lower rate I'd be willing to consider delaying...but only if I knew that lender two was solid on closing in a relatively short timeframe.

Across the remaining portfolio, I have a really good amount of equity which I can tap into based on opportunities but need to finish cleaning up my personal debt prior to going that route to get best rates etc.

You can try and fight it but does not mean you will be successfulI would also be curious to see what your property insurance looks likeFor me this is just another example that home prices are gonna eventually have to soften as between taxes, insurance and Interest rates home affordability is very challenging

In this market, with interest rates and prices at where they are, they're usually not viable (i.e. don't cash flow).

My in-laws loaned us the total purchase price minus $5,000 on a 3% interest rate.

Airbnb people have been discount seekers. try not to go by what you have heard,  but try it on one of your properties  and give it a few months  at a higher rate. 

PMs should have the widest network of contractors, knowing the good from the bad, better pricing, insights into rental rates/ condition of rentals to not over develop your unit.